I loved staying here! For years I've stayed at the Royal President Hotel right next door, so I enjoy this part of Bangkok. When I saw Monalisa's place on Airbnb I grabbed it right away.
The location is great! There is a 7-11 on the first floor, there are 2 grocery stores within a 10 minute walk. BTS Skytrain is nearby and all the restaurants, bars, and stores of Soi 11 minutes away.
As others have said, Monalisa has great communication. She goes out of her way to make sure you will have a good stay. She even provides directions to the property in Thai so you can show it to any cab driver, Uber driver or Grab driver (I recommend Grab in Bangkok).
There is a gym on the same floor. It's basic but has what you need for a weight training or aerobic workout.
AC works great. The WiFi kicks-ass! Fastest bandwidth I've had in Thailand. There is a full size refrigerator and a brand new laundry machine. (no dryer, but there is a drying rack).
The only negatives I found were:
Lighting in the bathroom is behind your head. So hard to see yourself in the mirror because you are backlit.
There is a shelf above bathroom sink. It's easy to bang your head on it when rinsing after shaving. I learned to be aware of it after the first time.
Not a good place to put your luggage if you want to keep it open. But lots of hangers and drawers in the closet.
I would totally stay there again. And most likely will soon.